:root {
  --bg: #f7f7f8;
  --text: #111111;
  --text-muted: #6b6b6b;
  --line: #e0e0e0;
  --accent: #2f5dff;
  --accent-soft: rgba(47, 93, 255, 0.15);
  --code-bg: #f2f2f3;
  --grid-size: 24px;
  --grid-line: rgba(17, 17, 17, 0.04);
  --panel-bg: #ffffff;
  --max-width: 1120px;
  --sans: "IBM Plex Sans", "Helvetica Neue", Helvetica, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101012;
    --text: #f0f0f0;
    --text-muted: #9a9a9a;
    --line: #2c2c2e;
    --accent: #7aa2ff;
    --accent-soft: rgba(122, 162, 255, 0.2);
    --code-bg: #141416;
    --grid-line: rgba(240, 240, 240, 0.04);
    --panel-bg: #161618;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  letter-spacing: 0.01em;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
}

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
}

a:hover {
  color: var(--accent);
  border-color: currentColor;
}

::selection {
  background: var(--accent-soft);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.site-header {
  padding: 4rem 0 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.brand h1,
.brand a {
  font-family: var(--mono);
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0;
  color: var(--accent);
}

.brand a {
  border-bottom: none;
}

.tagline {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 32rem;
  line-height: 1.5;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--text-muted);
  border-bottom: none;
  display: flex;
  align-items: center;
  font-size: 1.1rem;
}

.site-nav a:hover {
  color: var(--text);
}

main {
  padding: 3rem 0 4rem;
}

.page-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 3.5rem;
  align-items: start;
}

.content-panel {
  background: var(--panel-bg);
  padding: 3rem 3.5rem;
  margin-bottom: 3.5rem;
  position: relative;
}

.content-panel::before {
  content: "";
  position: absolute;
  inset: -8px;
  pointer-events: none;
  background:
    linear-gradient(var(--accent), var(--accent)) top left / 20px 1px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top left / 1px 20px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 20px 1px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 1px 20px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 20px 1px
      no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 1px 20px
      no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 20px 1px
      no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 1px 20px
      no-repeat;
}

.sidebar {
  position: sticky;
  top: 3rem;
  align-self: start;
  font-size: 0.85rem;
}

.sidebar-block {
  margin-bottom: 2.5rem;
}

.sidebar-title {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.sidebar-list a {
  color: var(--text);
  border-bottom: none;
}

.sidebar-list a[aria-current="page"] {
  color: var(--accent);
}

.sidebar-list a[aria-current="page"]::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.sidebar-home {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: none;
}

.sidebar-home:hover {
  color: var(--accent);
}

.sidebar-date {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 0.2rem;
}

.main-content,
.content-panel {
  min-width: 0;
}

.section {
  margin-bottom: 3rem;
}

.section + .section {
  padding-top: 2.5rem;
  position: relative;
}

.section + .section::before {
  content: "";
  display: block;
  width: 3rem;
  height: 2px;
  background: var(--line);
  position: absolute;
  top: 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.section-head h2 {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
}

.section-meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 38rem;
  line-height: 1.7;
}

.muted {
  color: var(--text-muted);
}

.post-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1.25rem 0;
  transition: opacity 0.2s ease;
}

.post-card:hover {
  opacity: 0.7;
}

.post-card + .post-card {
  padding-top: 1.75rem;
  position: relative;
}
.post-card + .post-card::before {
  content: "";
  display: block;
  width: 3rem;
  height: 2px;
  background: var(--line);
  position: absolute;
  top: 0;
}

.post-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.post-tags {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.series-toc {
  margin: 0 0 3rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--line);
  background: var(--panel-bg);
}

.series-label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.series-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.series-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.series-link {
  color: var(--text-muted);
  border-bottom: none;
}

.series-link:hover {
  color: var(--accent);
}

.series-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.series-list a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  color: var(--text);
  border-bottom: none;
}

.series-list a[aria-current="page"] {
  color: var(--accent);
}

.series-part {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.series-item-title {
  font-size: 0.95rem;
  line-height: 1.4;
}

.series-date {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tag {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  color: var(--text-muted);
  background: var(--code-bg);
}

.post-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.post-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.article-page .site-header {
  padding: 2rem 0 1.5rem;
}

.article-page .tagline {
  display: none;
}

.full-post {
  margin: 0;
}

.post-nav {
  margin-top: 3rem;
  padding-top: 2rem;
  position: relative;
}
.post-nav::before {
  content: "";
  display: block;
  width: 3rem;
  height: 2px;
  background: var(--line);
  position: absolute;
  top: 0;
}
.post-nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.post-nav a:hover {
  color: var(--accent);
}

.post-header {
  padding-bottom: 2rem;
  position: relative;
}
.post-header::after {
  content: "";
  display: block;
  width: 3rem;
  height: 2px;
  background: var(--line);
  margin-top: 2rem;
}

.post-header h1 {
  font-size: 2.25rem;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin: 0.6rem 0 0;
}

.post-intro {
  margin: 1.1rem 0 0;
  color: var(--text-muted);
  max-width: 68ch;
  line-height: 1.6;
  font-size: 1rem;
}

.content {
  line-height: 1.7;
  font-size: 1rem;
  text-align: justify;
  max-width: 68ch;
  margin: 0 auto;
}

.content h2 {
  margin: 3rem 0 1.25rem;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.content h3 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.content p {
  max-width: none;
  margin: 0 0 1.1rem;
}

.content ul,
.content ol {
  max-width: none;
  margin: 0 0 1.1rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.4rem;
}

.content li::marker {
  color: var(--text-muted);
}

.content blockquote {
  margin: 1.75rem 0;
  padding: 0 0 0 1.5rem;
  border-left: 2px solid var(--line);
  color: var(--text-muted);
  max-width: none;
}

.content blockquote p {
  margin-bottom: 0.5rem;
}

.content a {
  color: var(--accent);
  border-color: transparent;
}

.content a:hover {
  border-color: currentColor;
}

.content pre {
  background: var(--code-bg);
  padding: 1.4rem 1.6rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 1.75rem 0;
}

.content img {
  max-width: 100%;
  height: auto;
  margin: 2rem 0;
}

code {
  font-family: var(--mono);
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  font-size: 0.88em;
}

pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

hr {
  border: none;
  margin: 2.5rem auto;
  width: 3rem;
  height: 2px;
  background: var(--line);
}

footer {
  margin-top: 4rem;
  padding: 2.5rem 0 3.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.pagination {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-link {
  border: 1px solid var(--line);
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.page-link[aria-current="page"] {
  color: var(--text);
  border-color: var(--text);
}

.topic {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
}

.topic-header {
  margin-bottom: 2rem;
}

.topic-header h1 {
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
  padding-left: 0.75rem;
  border-left: 2px solid var(--accent);
}

.topic-header p {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  main {
    padding: 2rem 0 3rem;
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .sidebar {
    position: static;
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    padding-bottom: 2rem;
  }

  .sidebar-block {
    margin-bottom: 0;
  }

  .content-panel {
    padding: 2rem;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 1.25rem;
  }

  .site-header {
    padding: 2.5rem 0 1.75rem;
  }

  .content-panel {
    padding: 1.5rem;
  }

  .post-header h1 {
    font-size: 1.75rem;
  }

  .content pre {
    padding: 1.25rem;
    font-size: 0.82rem;
  }
}